Heparin is the commonly used anticoagulant in cardiac surgery. All of the following are true about heparin EXCEPT:

Heparin is the strongest organic acid found in human beings. It acts by activating AT-III that inhibits factor Xa and IIa. Adverse effects of heparin are: Bleeding, Osteoporosis, Thrombocytopenia, Hypersensitivity, Alopecia. Most commercial preparations of heparin are derived from ox lung and pig intestine.